Submittal Sheet

Data sheet Thermostatic expansion valves, type TUA/TUAE and TCAE
23DKRCC.PD.AG0.A4.22 / 520H8945
Design
1. Bulb with capillary tube
2. Thermostatic element with
diaphragm
3. Setting spindle for
adjustment of static
superheat SS
4. Orice assembly
5. Filter
Fig. 4
1
1
2
5
4
3
2
4
Danfoss 68U38.12
TU operation and function Bi-ow
Bi-ow function is sometimes used in systems
with 4-way reversing valves where hot gas defrost
or heating cycles are required.
Only TUAE (orices 1 – 8), and TCAE (orices 1 and
2) - without MOP charges, can be used in bi-ow
mode.
Note that the reverse direction can reduce the
rated capacity by up to 15%.
Valves for bi-ow operation should be installed
so that the normal refrigerant ow through the
valve direction is toward the main evaporator.
MOP - Maximum Operating Pressure
MOP function protects the compressor motor
against overload during start-up.
MOP is the evaporating pressure at which the
expansion valve will throttle liquid injection into
the evaporator and thus prevent the evaporating
pressure from rising.
MOP valves are primarily used in low temperature
applications with a single evaporator and a single
compressor. MOP occurs when the sensor reaches
a predetermined maximum value.
Above MOP any increase in sensor temperature
results in only minimal additional opening of the
expansion valve.
An MOP charge is also known as a pressure
limiting charge.
Note: The MOP point will change if the factory
superheat setting of the expansion valve is
changed.
Danfoss R64-3004.10
TUAE / TCAE
Thermostatic expansion valve
DML / DCL
Filter drier
STF
4-way valve